JPS6125024A - Measuring method of liquid level - Google Patents

Measuring method of liquid level

Info

Publication number
JPS6125024A
JPS6125024A JP14430384A JP14430384A JPS6125024A JP S6125024 A JPS6125024 A JP S6125024A JP 14430384 A JP14430384 A JP 14430384A JP 14430384 A JP14430384 A JP 14430384A JP S6125024 A JPS6125024 A JP S6125024A
Authority
JP
Japan
Prior art keywords
tank
liquid level
volume
liquid
resonance frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP14430384A
Other languages
Japanese (ja)
Inventor
Yukio Kagawa
加川　幸雄
Hidekazu Ando
英一 安藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPC Electronics Corp
Original Assignee
SPC Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SPC Electronics Corp filed Critical SPC Electronics Corp
Priority to JP14430384A priority Critical patent/JPS6125024A/en
Publication of JPS6125024A publication Critical patent/JPS6125024A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE:To prevent measuring errors due to the movement of the surface of liquid and the tilt of a tank, by providing a wave transmitter 3 in a tube shaped tower of the tank containing the liquid, detecting the resonance frequency corresponding to the volume of a gas accompanied by the generation of sound waves, and computing the liquid level. CONSTITUTION:A tower part 5 is provided on the upper surface at one end of a tank 1. A wave transmitter 3 of ultrasonic waves is provided in the upper part of the tower part 5. The sound waves are generated by the sound transmitter 3, and the tower part 5 and the inside of the tank 1 are vibrated. Based on the resonance frequency, the volume of air in the tank is computed.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は液体レベルの測定方法に関するものである。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method for measuring liquid level.

（従来の技術） 従来の測定方法は、第３図に示すように、タンク／内に
液体コを収納し、タンク／の上方に超音波の送波器３と
受波器グとを設置し、送波器３から発射された音波が液
面で反射され、受波器グまで戻ってくる往復時間を計則
するようになっていた。(Prior art) As shown in Fig. 3, the conventional measurement method involves storing a liquid in a tank and installing an ultrasonic transmitter 3 and a receiver above the tank. The round trip time for the sound waves emitted from the transmitter 3 to be reflected on the liquid surface and return to the receiver 3 is measured.

（発明が解決しようとする問題点） 前記の方法においては、何らかの理由で液面が揺れたり
、或いはタンクが傾いたりした場合には測定誤差が生じ
る欠点があった。(Problems to be Solved by the Invention) The above-described method has the drawback that measurement errors occur if the liquid level fluctuates or the tank tilts for some reason.

そこで、本発明においては液面の揺れやタンク傾斜によ
り変化しない気体の体積に着目し７、気体の体積が気体
の共振周波数の自乗の逆数に比例することを利用して測
定するものである。Therefore, in the present invention, we focus on the volume of gas that does not change due to fluctuations in the liquid level or tilt of the tank, and measure it by utilizing the fact that the volume of gas is proportional to the reciprocal of the square of the resonance frequency of the gas.

〔発明の構成〕[Structure of the invention]

（問題点を解決するだめの手段） 本発明方法においては、液体ノを収納したタンク／に筒
状の塔部Ｓを設げ、この塔部Ｓ内に送波器３を投首して
音波を発生させ、音波発生に伴う気体の体積に応じた共
振周波数を検出し、この検出値から液体レベルを換算す
るように［７たものである。(Means for Solving the Problem) In the method of the present invention, a cylindrical tower S is provided in a tank containing liquid, and a wave transmitter 3 is inserted into the tower S to generate sound waves. is generated, a resonance frequency corresponding to the volume of gas accompanying the generation of sound waves is detected, and the liquid level is converted from this detected value [7].

（作　用） 本発明においてはタンク／に設けた塔部Ｓ内に設置した
送波器３から音波を発生させ、塔部Ｓ内の空気振動を持
続させる。この空気振動の発生に伴う共振周波数を検出
する。共振周波数はタンクの気体の体積に比例するもの
であるから、気体の体積と共振周波数との関係を予め算
出しておくことにより、共振周波数の検出値から液体レ
ベルを換算することができる。(Function) In the present invention, a sound wave is generated from the wave transmitter 3 installed in the tower section S provided in the tank/, and the air vibration within the tower section S is maintained. The resonance frequency associated with the occurrence of this air vibration is detected. Since the resonance frequency is proportional to the volume of gas in the tank, by calculating the relationship between the volume of gas and the resonance frequency in advance, it is possible to convert the liquid level from the detected value of the resonance frequency.

（実施例） 本発明の実施例を第１図に基いて詳細に説明すると、タ
ンク／の一端上面に筒状の塔部Ｓを設け、この塔部Ｓの
上部に超音波の送波器３を設置し、この送波器３に１ｉ
ｒａ示を省略した信号発生器より、第２１Ｙ１に示すよ
うな、時間と共に周波数の変化を繰返す信号を印加し、
音波を発生させる。(Embodiment) An embodiment of the present invention will be described in detail based on FIG. and connect 1i to this transmitter 3.
Applying a signal whose frequency repeats changes over time as shown in 21Y1 from a signal generator omitting the ra indication,
Generate sound waves.

発生した音波は、成る周波数において塔部左の空気を駆
動することになり空気振動が持続をれる。これは塔部左
円の空気の質量が、タンク／内の空気乙の体積の空気ば
ねの復元力と釣り合うことによるもので、ヘルムホルツ
共鳴と云われるもので、この時の周波数が、共振周波数
として次式で表わされる。The generated sound waves drive the air on the left side of the tower at a certain frequency, resulting in sustained air vibrations. This is because the mass of the air in the left circle of the tower balances the restoring force of the air spring of the volume of air inside the tank, which is called Helmholtz resonance, and the frequency at this time is called the resonant frequency. It is expressed by the following formula.

但し、ｆ：共振周波数 γ：等温等圧比熱比 Ｐ：圧　力 Ａ：塔部の断面積 ｌ：塔部の高さ ρ：空気の密度 ■：タンク内の空気の体積 上式から明らかなように、共振周波数ｆはタンク／内の
空気の体積Ｖにより決まるものであり、空気の形状には
よらないので、液面の揺れ、或いはタンク／の傾きによ
る影響を受けない。However, f: Resonance frequency γ: Isothermal and isobaric specific heat ratio P: Pressure A: Cross-sectional area of the column l: Height of the column ρ: Density of air ■: As is clear from the volumetric equation of the air in the tank Furthermore, the resonance frequency f is determined by the volume V of the air in the tank and is not dependent on the shape of the air, so it is not affected by fluctuations in the liquid level or inclination of the tank.

したがって、予め液体コの容量或いは液深と共振周波数
との関係を算出しておくことにより、液深の変化は空気
の体積を変化させることになるので、共振周波数ｆを測
定することにより液体コのレベルを算出することができ
る。Therefore, by calculating in advance the relationship between the volume or depth of the liquid and the resonant frequency, changes in the liquid depth will change the volume of air, so by measuring the resonance frequency f, the relationship between the resonant frequency and the volume of the liquid can be calculated. It is possible to calculate the level of

共振周波数の検出には送波器３に印刀口される電気信号
の電圧、電流値より算出でれるインピーダンス又はアド
ミッタンスを求めることにより行う。又は、タンク／の
内部又は槽壁外或いはタンク／の近傍に受波装置を設置
することにより音響的な手段を用いて求めることも可能
である。The resonance frequency is detected by determining the impedance or admittance calculated from the voltage and current values of the electric signal applied to the transmitter 3. Alternatively, it is also possible to obtain it using acoustic means by installing a wave receiving device inside the tank, outside the tank wall, or near the tank.

〔発明の効果〕〔Effect of the invention〕

本発明においては、気体の体積の変化を共振周波数の変
化とし２てとらえ、液体のレベルを測定するものである
から、液面の変動或いはタンクの傾き々とに影響される
ことがなく、信頼性の高い測定を行うことができる。In the present invention, since the liquid level is measured by measuring the change in the volume of the gas as a change in the resonance frequency2, it is not affected by changes in the liquid level or the tilt of the tank, and is reliable. It is possible to perform highly accurate measurements.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明に係る液体レベルの測定方法の一実施例
の断面図、第２図は周波数と時間との関係を示す図、第
３図は従来装置の断面図を夫々示す。 尚、図中／はタンク、２は液体、３は送波器、左は塔部
、乙は気体である。FIG. 1 is a sectional view of an embodiment of the liquid level measuring method according to the present invention, FIG. 2 is a diagram showing the relationship between frequency and time, and FIG. 3 is a sectional view of a conventional device. In the figure, / is a tank, 2 is a liquid, 3 is a transmitter, the left is a tower, and O is a gas.

Claims (1)

【特許請求の範囲】[Claims] 液体２を収納したタンク１に筒状の塔部５を設け、この
塔部５内に送波器３を設置して音波を発生させ、音波発
生に伴う気体の体積に応じた共振周波数を検出し、この
検出値から液体レベルを換算することを特徴とする液体
レベルの測定方法。A cylindrical tower part 5 is provided in a tank 1 containing liquid 2, a wave transmitter 3 is installed inside this tower part 5 to generate sound waves, and a resonance frequency corresponding to the volume of gas accompanying the sound wave generation is detected. A liquid level measuring method characterized in that the liquid level is converted from this detected value.
JP14430384A 1984-07-13 1984-07-13 Measuring method of liquid level Pending JPS6125024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14430384A JPS6125024A (en) 1984-07-13 1984-07-13 Measuring method of liquid level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14430384A JPS6125024A (en) 1984-07-13 1984-07-13 Measuring method of liquid level

Publications (1)

Publication Number Publication Date
JPS6125024A true JPS6125024A (en) 1986-02-03

Family

ID=15358935

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14430384A Pending JPS6125024A (en) 1984-07-13 1984-07-13 Measuring method of liquid level

Country Status (1)

Country Link
JP (1) JPS6125024A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63163420U (en) * 1987-04-14 1988-10-25
JPS63298013A (en) * 1987-05-29 1988-12-05 Yasushi Ishii Volumeter
JP2017207486A (en) * 2016-05-19 2017-11-24 博泰科技有限公司 Cup comprising water quantity measurement function
US10573584B2 (en) 2011-04-04 2020-02-25 Rohm Co., Ltd. Semiconductor device and method for manufacturing semiconductor device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58105016A (en) * 1981-12-17 1983-06-22 Mazda Motor Corp Measuring device for liquid quantity in enclosed container

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58105016A (en) * 1981-12-17 1983-06-22 Mazda Motor Corp Measuring device for liquid quantity in enclosed container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63163420U (en) * 1987-04-14 1988-10-25
JPS63298013A (en) * 1987-05-29 1988-12-05 Yasushi Ishii Volumeter
US10573584B2 (en) 2011-04-04 2020-02-25 Rohm Co., Ltd. Semiconductor device and method for manufacturing semiconductor device
JP2017207486A (en) * 2016-05-19 2017-11-24 博泰科技有限公司 Cup comprising water quantity measurement function

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